Free Developer Tools Tools
Free developer tools for engineers, DevOps practitioners, and technical teams who need reliable utilities without leaving the browser. Format and validate JSON, encode and decode Base64 strings and files, compare code changes with a line-by-line diff, generate cryptographically secure passwords, decode JWT tokens, test regular expressions with live highlighting, and generate UUIDs — all running locally with no data leaving your device.
These utilities handle the tiny-but-essential tasks that break your flow when you have to Google for them or spin up a local script. Bookmark this page and keep shipping. Every tool is free forever, requires no account, and works offline once cached.
6 free tools available now
Password Generator
Free password generator that creates strong, cryptographically random passwords in your browser. Choose length, character types, and generate up to 10 passwords at once. No signup required.
JSON Formatter
Free JSON formatter and validator. Paste messy JSON to instantly format, validate, and highlight errors. Supports minify, indent options, and copy. No signup required.
Base64 Encoder / Decoder
Free Base64 encoder and decoder. Encode text or files to Base64 and decode Base64 strings back to text. Supports file to data URI encoding. No signup required.
Text Diff Checker
Free text diff checker. Paste two blocks of text to instantly see what was added, removed, or changed line by line. Great for comparing documents, code, or any text. No signup required.
CSV to JSON Converter
Free CSV to JSON converter. Paste or upload any CSV file and get clean, formatted JSON in seconds. Auto-detects delimiter, handles headers, supports large files. 100% in-browser, no signup.
JSON to CSV Converter
Free JSON to CSV converter. Paste or upload a JSON array of objects and download a clean CSV in seconds. Handles nested objects with dot-notation flattening. 100% in-browser, no signup.
Coming soon
These tools are in development. Check back soon.
UUID Generator
SoonFree UUID generator. Generate version 1, 4, and 5 UUIDs in bulk. Copy individually or as a JSON array. No signup.
Regex Tester
SoonFree regex tester with live match highlighting, capture groups, and flag toggles. Supports JavaScript regex syntax.
JWT Decoder
SoonFree JWT decoder. Paste any JSON Web Token to see the decoded header, payload, and signature details. No signup, no server.
All free developer tools tools
Every tool listed below is 100% free, requires no account, and runs entirely in your browser — your data never leaves your device.
🔐 Free Password Generator
Free password generator that creates strong, cryptographically random passwords in your browser. Choose length, character types, and generate up to 10 passwords at once. No signup required.
🔧 Free JSON Formatter
Free JSON formatter and validator. Paste messy JSON to instantly format, validate, and highlight errors. Supports minify, indent options, and copy. No signup required.
🔢 Free Base64 Encoder / Decoder
Free Base64 encoder and decoder. Encode text or files to Base64 and decode Base64 strings back to text. Supports file to data URI encoding. No signup required.
🔍 Free Text Diff Checker
Free text diff checker. Paste two blocks of text to instantly see what was added, removed, or changed line by line. Great for comparing documents, code, or any text. No signup required.
📋 Free CSV to JSON Converter
Free CSV to JSON converter. Paste or upload any CSV file and get clean, formatted JSON in seconds. Auto-detects delimiter, handles headers, supports large files. 100% in-browser, no signup.
🔄 Free JSON to CSV Converter
Free JSON to CSV converter. Paste or upload a JSON array of objects and download a clean CSV in seconds. Handles nested objects with dot-notation flattening. 100% in-browser, no signup.